ChemInform Abstract: DETERMINATION OF ELECTROCHEMICAL KINETIC PARAMETERS BY SQUARE-WAVE POLAROGRAPHY. POLAROGRAPHIC REDUCTION OF ZINC(II) IN CONCENTRATED NITRATE AND PERCHLORATE SUPPORTING ELECTROLYTE SOLUTIONS

1978 ◽  
Vol 9 (34) ◽  
Author(s):  
H. L. JINDAL ◽  
K. MATSUDA ◽  
R. TAMAMUSHI
Keyword(s):  
Kinetic Parameters ◽  
Supporting Electrolyte ◽  
Electrolyte Solutions ◽  
Polarographic Reduction ◽  
Square Wave

Determination of electrochemical kinetic parameters by square-wave polarography

1978 ◽  
Vol 90 (2) ◽  
pp. 185-196 ◽  
Author(s):  
Harbans L. Jindal ◽  
Kiyoshi Matsuda ◽  
Reita Tamamushi
Keyword(s):  
Kinetic Parameters ◽  
Square Wave

scholarly journals A Square-Wave Adsorptive Stripping Voltammetric Method for Determination of Fast Green Dye

2009 ◽  
Vol 92 (6) ◽  
pp. 1714-1719
Author(s):  
Ali F Al-Ghamdi
Keyword(s):  
Soft Drink ◽  
Supporting Electrolyte ◽  
Pulse Amplitude ◽  
Fast Green ◽  
Experimental Conditions ◽  
Analytical Methodology ◽  
Square Wave ◽  
Carbonate Buffer ◽  
Enhanced Sensitivity

Abstract Square-wave adsorptive stripping voltammetric (SW-AdSV) determinations of trace concentrations of the coloring agent fast green were described. The analytical methodology used was based on the adsorptive preconcentration of the dye on the hanging mercury drop electrode, and then a negative sweep was initiated. In pH 10 carbonate supporting electrolyte, fast green gave a well-defined and sensitive SW-AdSV peak at 1220 mV. The electroanalytical determination of this dye was found to be optimized in carbonate buffer (pH 10) with the following experimental conditions: accumulation time (120 s); accumulation potential (0.8 V); scan rate (800 mV/s); pulse amplitude (90 mV); frequency (90 Hz); surface area of the working electrode (0.6 mm2); and the convection rate (2000 rpm). Under these optimized conditions, the AdSV peak current was proportional over the concentration range 2 1086 107 M (r = 0.999), with an LOD of 1.63 1010 M (0.132 ppb). This analytical approach possessed more enhanced sensitivity than conventional chromatography or spectrophotometry, and was simple and quick. The precision of the method in terms of RSD was 0.17, whereas the accuracy was evaluated via the mean recovery of 99.6. Possible interferences by several substances usually present as food additive azo dyes (E110, E102, E123, and E129), natural and artificial sweeteners, and antioxidants were also investigated. Applicability of the developed electroanalysis method was illustrated via the determination of fast green in ice cream and soft drink samples.

scholarly journals SQUARE WAVE CATHODIC STRIPPING VOLTAMMETRY ADSORPTIVE FOR NICKEL AND COBALT ANALYSIS

2010 ◽  
Vol 6 (2) ◽  
pp. 161-164
Author(s):  
Saryati Saryati ◽  
Sumardjo Sumardjo
Keyword(s):  
Supporting Electrolyte ◽  
Stripping Voltammetry ◽  
Adsorption Potential ◽  
Adsorption Time ◽  
Square Wave ◽  
Cathodic Stripping Voltammetry ◽  
Complex Nickel ◽  
Electrolyte Ph ◽  
Cathodic Stripping

The adsorptive stripping voltammetric determination of Ni and Co based on adsorption of the Ni/Co and dimethylglioxime (DMG) complex on a hanging mercury drop electrode is studied. The reduction current of the adsorbed DMG complex is measured by square wave cathodic stripping voltammetry method. The effect of various parameters such as ligand concentration, pH of supporting electrolytic, adsorption potential and adsorption time on the current peak of Ni and Co voltammogram were studied. Optimum condition of this method are supporting electrolyte pH 9, DMG concentration 5×10 -4 M, adsorption potential -0.7 V vs Ag/AgCl and adsorption time 180 second. A linier relationship between the current peak and Ni or Co concentration was obtained in the range 5 - 30 ng/mL and the detection limit 0.6 ng/ml for both Ni and Co. The recovery of Ni and Co were 98.11-104.17% using standard biological materials with RSD 2.59 - 10.37%. Based on ";t"; test can be conclude that the result are nearly equal to the standard reference material.   Keywords: adsorptive stripping voltammetric, dimethylglioxime complex, nickel, cobalt

Square-wave adsorptive stripping voltammetric determination of an antihistamine drug astemizole

2008 ◽  
Vol 62 (4) ◽  
Author(s):  
Ahmad Alghamdi
Keyword(s):  
Biological Fluids ◽  
Supporting Electrolyte ◽  
Reduction Process ◽  
High Sensitivity ◽  
Pulse Amplitude ◽  
Analytical Methodology ◽  
Square Wave ◽  
Pharmaceutical Tablets ◽  
Method Accuracy

AbstractThe square-wave voltammetric technique was used to explore the adsorption properties of the astemizole drug. The analytical methodology used was based on the adsorptive preconcentration of the drug on a hanging mercury drop electrode (HMDE), followed by the electrochemical reduction process which yielded a well-defined cathodic peak at −1.184 V (vs. the Ag/AgCl electrode). To achieve high sensitivity, various experimental and instrumental variables were investigated such as the supporting electrolyte, pH, accumulation time and potential, drug concentration, scan rate, SW frequency, pulse amplitude, convection rate, and the working electrode area. Under the optimized conditions, the AdSV peak current was proportional over the analyte concentration range of 5 × 10−7 to 2.5 × 10−6 mol L−1 (r = 0.998) with the detection limit of 1.4 × 10−8 mol L−1 (6.4 ng mL−1). The precision of the proposed method in terms of RSD was 2.4 %, whereas the method accuracy was indicated by the mean recovery of 100.1 %. Possible interferences of several substances usually present in the pharmaceutical tablets and formulations were also evaluated. The applicability of this electroanalytic approach was illustrated by the determination of astemizole in tablets and biological fluids.

scholarly journals Square-wave voltammetric determination of drospirenone and ethinylestradiol in pharmaceutical dosage form using square wave technique

2019 ◽  
Vol 10 (4) ◽  
pp. 305-316
Author(s):  
Ibrahim Hassan Habib ◽  
Mohammed Salem Rizk ◽  
Maha Sultan ◽  
Dalia Mohamed ◽  
Rehab Moussa Tony
Keyword(s):  
Supporting Electrolyte ◽  
Reference Method ◽  
Pulse Amplitude ◽  
Voltammetric Determination ◽  
Pharmaceutical Dosage Form ◽  
Square Wave ◽  
Significant Difference ◽  
Scan Rate ◽  
Wave Technique

Cathodic voltammetric behaviors of drospirenone and ethinylestradiol were used for the simultaneous determination of both drugs in bulk and in pharmaceutical formulation (Yasmin® tablets) without the interference of excipients. The determinations were made on hanging mercury dropping electrode using square-wave technique in a voltammetric cell containing 10 mL of 0.04 mole/L Britton-Robinson. After every aliquot addition, the solution was stirred for 10 s at 1000 rpm, rested for 10 s then square wave voltammetry mode was ramped from +100 to -1700 mV with scan rate of 100 mV/s, pulse amplitude of 50 mV and measurement time of 5 ms. Several factors such as pH, type of supporting electrolyte, pulse amplitude and scan rate were studied to optimize the condition for voltammetric determination of these drugs. With optimized experimental parameters, a good linearity was obtained for both drugs over a range of 1.36×10-6 to 1.91×10-7 mole/L and 6.75×10-8 to 6.07×10-7 mol/L of drospirenone and ethinylestradiol, respectively. Characterization of the proposed method was done according to International Conference on Harmonization, Q2B: Validation of Analytical procedures. The proposed method was statistically compared with the reference method and the results revealed no significant difference regarding accuracy and precision.

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